not applicable here
if you have a rational funciton, and you want to take the limit as x goes to some number, the first step is to plug in the number
if you get a number back, that is your answer
if you get \(\frac{a}{0}\) where \(a\neq 0\) there is no limit
if you get \(\frac{0}{0}\) there is more work to be done
factor and cancel
but in this case you get \(\frac{-4}{0}\) so forget it